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FreeGovernmentUnited Kingdom
UK Defra Hydrology API
Historic and real-time hydrology data
environment.data.gov.uk
At a glance
- Region
- United Kingdom
- Coverage
- 8000+ monitoring stations
- Access
- Free
- Category
- Government
- Last updated
- 2025
What's inside
- API Access
- JSON
- CSV
- REST API
- 15-minute resolution
What you can do with it
Typical work that data of this type supports.
- 01
Design flows
Estimate 1-in-50 and 1-in-100 year floods for bridges, culverts and spillways.
- 02
Low flows
Set environmental flows and check what is left in the river in a dry year.
- 03
Model calibration
Calibrate and test catchment models against observed flow.
Where AI adds value
Ideas for machine learning and AI agents built on this kind of data.
- 01
Flow forecasting
Train LSTM-style models on past records to forecast river levels and flow days ahead.
- 02
Ungauged basins
Combine with catchment data to estimate flow where there is no gauge.
- 03
Automatic QC
Flag gauge errors, shifts and gaps before they reach a report.
Related water data
- UK Environment Agency Flood APIUnited Kingdom | Free
- EPA Envirofacts Data APIUnited States | Free
- UK Water Framework DatabaseUnited Kingdom | Free
- USGS Water Services APIUnited States | Free
- CEDA - Gridded Groundwater Abstraction Dataset for England (1999-2014)Europe | Free
- Environment Agency Water DataUnited Kingdom | Free
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